Please use this identifier to cite or link to this item: http://repositorio.unicamp.br/jspui/handle/REPOSIP/244261
Type: Artigo de periódico
Title: Monotectic Al-bi-sn Alloys Directionally Solidified: Effects Of Bi Content, Growth Rate And Cooling Rate On The Microstructural Evolution And Hardness
Author: Costa
Thiago A.; Freitas
Emmanuelle S.; Dias
Marcelino; Brito
Crystopher; Cheung
Noe; Garcia
Amauri
Abstract: Al-based monotectic alloys can have interesting tribological characteristics with the solute acting as a solid lubricant, while the matrix provides required structural integrity. The addition of third elements can increase the alloy load capacity. The microstructural features of these alloys, such as morphology, distribution and length scale of the phases depend strongly on the parameters of their manufacture route. In the present study monotectic Al-Bi-Sn alloys were directionally solidified (DS) under a large range of experimental cooling rates, permitting a wide spectrum of microstructural scales to be examined. Experimental correlations between the microstructure interphase spacing and solidification cooling rate and growth rate are proposed. Despite a slight increase in hardness with smaller interphase spacings for regions closer to the cooled surface of the DS alloys castings having 2 and 3.2wt.%Bi, it is shown that the Bi content of the alloy has not a significant effect on hardness. It is also shown that the experimental correlations established between the cooling rate and both the interphase spacing and area fractions of droplets of the eutectic mixture can be used in the tailoring of the microstructure of Al-Bi-Sn alloys with a view to applications in the manufacture of wear resistant components. (C) 2015 Elsevier B.V. All rights reserved.
Subject: Phase-separation
Aluminum-alloys
Miscibility Gap
Fabrication
Country: LAUSANNE
Editor: ELSEVIER SCIENCE SA
Citation: Monotectic Al-bi-sn Alloys Directionally Solidified: Effects Of Bi Content, Growth Rate And Cooling Rate On The Microstructural Evolution And Hardness. Elsevier Science Sa, v. 653, p. 243-254 DEC-2015.
Rights: embargo
Identifier DOI: 10.1016/j.jallcom.2015.09.009
Address: http://www.sciencedirect.com/science/article/pii/S0925838815309853
Date Issue: 2015
Appears in Collections:Unicamp - Artigos e Outros Documentos

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